[news.eclipse.platform.swt] Re: How would I implement zoom-in-region for

["Grant Gayed" <grant_gayed@xxxxxxxxxx>]

tracker.open() blocks until the tracker has been closed, so you can infer
that a MouseUp or an Esc (cancel) occurred when this method returns.

Grant


"Adam Preble" <adam.preble@xxxxxxxxx> wrote in message
news:f84c1b3069c11ad2f1e947ad7cf6ed9e$1@xxxxxxxxxxxxxxxxxx
> Grant,
>
> Thanks for the reference to Tracker.  I have been dabbling with it on and
> off the past few days.  I took the snippet that draws a fix-sized box and
> started to hack at it.  I figured out the SWT.RESIZE style is the one I
> want for my redrawable rectangle.
>
> There's one problem; I can't seem to get MouseUp events to work.  I got
> the initial MouseDown event to work since it creates the tracker, but I
> want a MouseUp event to know when user is finished drawing the tracker.
> I've tried a generic listener with SWT.MouseUp, as well as a MouseListener
> with MouseUp() overridden.  Neither seems to work.
>
> This might be a more generic problem that warrants its own thread, but I
> thought I'd tack it on to this discussion first.  Here is my source code.
>
> package practice;
>
> import org.eclipse.swt.SWT;
> import org.eclipse.swt.events.ControlEvent;
> import org.eclipse.swt.events.ControlListener;
> import org.eclipse.swt.events.MouseEvent;
> import org.eclipse.swt.events.MouseListener;
> import org.eclipse.swt.graphics.Rectangle;
> import org.eclipse.swt.widgets.Display;
> import org.eclipse.swt.widgets.Event;
> import org.eclipse.swt.widgets.Listener;
> import org.eclipse.swt.widgets.Shell;
> import org.eclipse.swt.widgets.Tracker;
>
> public class TrackerMouseDown {
>
> private static int firstX = -1;
> private static int firstY = -1;
> private static Display display;
> private static Shell shell;
>
> private static ControlListener trackerListener = new ControlListener() {
> public void controlMoved(ControlEvent e) {
> System.out.println("Moved");
> }
>
> public void controlResized(ControlEvent e) {
> System.out.println("Resized");
> }
> };
>
> /* Experiment with a MouseListener
> private static MouseListener mouseListener = new MouseListener() {
> public void mouseDown(MouseEvent e) {
> System.out.println("Mouse is down");
> firstX = e.x;
> firstY = e.y;
>
> // Use the RESIZE style to insist on drawing a resizeable rectangle
> Tracker tracker = new Tracker(shell, SWT.RESIZE);
> tracker.addControlListener(trackerListener);
> tracker.setRectangles(new Rectangle[] { new Rectangle(firstX, firstY,
> e.x - firstX, e.y - firstY), });
> tracker.open();
> }
>
> public void mouseUp(MouseEvent e) {
> System.out.println("Mouse is up");
> }
>
> public void mouseDoubleClick(MouseEvent arg0) {
> // TODO Auto-generated method stub
>
> }
> };
> */
>
> private static Listener listener = new Listener() {
> public void handleEvent(Event e) {
> switch(e.type) {
> case SWT.MouseDown:
> System.out.println("Mouse is down");
> firstX = e.x;
> firstY = e.y;
>
> // Use the RESIZE style to insist on drawing a resizeable rectangle
> Tracker tracker = new Tracker(shell, SWT.RESIZE);
> tracker.addControlListener(trackerListener);
> tracker.setRectangles(new Rectangle[] { new Rectangle(firstX, firstY,
> e.x - firstX, e.y - firstY), });
> tracker.open();
> break;
> case SWT.MouseUp:
> System.out.println("Mouse is up");
> break;
>
> case SWT.MouseMove:
> // Do nothing for now
> break;
>
> }
> }
> };
>
> public static void main(String[] args) {
>
> display = new Display();
> shell = new Shell(display);
>
> shell.open();
> shell.addListener(SWT.MouseDown, listener);
> shell.addListener(SWT.MouseUp, listener);
> shell.addListener(SWT.MouseMove, listener);
>
> /*  MouseListener
> shell.addMouseListener(mouseListener);
> */
> while (!shell.isDisposed()) {
> if (!display.readAndDispatch())
> display.sleep();
> }
> display.dispose();
> }
> }
>
>
>